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<h1>C++ Support in Clang</h1>
<!--*************************************************************************-->
<p>Last updated: $Date$</p>

<p>Clang fully implements all published ISO C++ standards (<a
href="#cxx98">C++98 / C++03</a>, <a
href="#cxx11">C++11</a>, and <a
href="#cxx14">C++14</a>), and most of the upcoming <a
href="#cxx17">C++1z</a> standard.

<p>The Clang community is continually striving to improve C++ standards
compliance between releases by submitting and tracking <a
href="cxx_dr_status.html">C++ Defect Reports</a> and implementing resolutions
as they become available.</p>

<p>Experimental work is also under way to implement <a href="#ts">C++ Technical
Specifications</a> that will help drive the future of the C++ programming
language.</p>

<p>The <a href="http://llvm.org/bugs/">LLVM bug tracker</a> contains Clang
C++ components that track known bugs with Clang's language conformance in
each language mode.</p>

<h2 id="cxx98">C++98 implementation status</h2>

<p>Clang implements all of the ISO C++ 1998 standard
  (including the defects addressed in the ISO C++ 2003 standard)
  except for <tt>export</tt> (which was removed in C++11).

<h2 id="cxx11">C++11 implementation status</h2>

<p>Clang 3.3 and later implement all of the <a
  href="http://www.iso.org/iso/catalogue_detail.htm?csnumber=50372">ISO
  C++ 2011 standard</a>.

<p>By default, Clang builds C++ code according to the C++98 standard, with many
C++11 features accepted as extensions. You can use Clang in C++11 mode with the
<code>-std=c++11</code> option. Clang's C++11 mode can be used
with <a href="http://libcxx.llvm.org/">libc++</a> or with gcc's libstdc++.

<details>
<summary>List of features and minimum Clang version with support</summary>

<table width="689" border="1" cellspacing="0">
 <tr>
    <th>Language Feature</th>
    <th>C++11 Proposal</th>
    <th>Available in Clang?</th>
 </tr>
     <tr>
      <td>Rvalue references</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2118.html">N2118</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>&nbsp;&nbsp;&nbsp;&nbsp;Rvalue references for <code>*this</code></td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2439.htm">N2439</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Initialization of class objects by rvalues</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1610.html">N1610</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Non-static data member initializers</td>
      <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2008/n2756.htm">N2756</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Variadic templates</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2242.pdf">N2242</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>&nbsp;&nbsp;&nbsp;&nbsp;Extending variadic template template parameters</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2555.pdf">N2555</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Initializer lists</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2672.htm">N2672</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Static assertions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1720.html">N1720</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td><code>auto</code>-typed variables</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1984.pdf">N1984</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>&nbsp;&nbsp;&nbsp;&nbsp;Multi-declarator <code>auto</code></td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1737.pdf">N1737</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>&nbsp;&nbsp;&nbsp;&nbsp;Removal of auto as a storage-class specifier</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2546.htm">N2546</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>&nbsp;&nbsp;&nbsp;&nbsp;New function declarator syntax</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2541.htm">N2541</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Lambda expressions</td>
      <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2927.pdf">N2927</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Declared type of an expression</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2343.pdf">N2343</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>&nbsp;&nbsp;&nbsp;&nbsp;Incomplete return types</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3276.pdf">N3276</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Right angle brackets</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1757.html">N1757</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Default template arguments for function templates</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#226">DR226</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Solving the SFINAE problem for expressions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2634.html">DR339</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Alias templates</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2258.pdf">N2258</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Extern templates</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1987.htm">N1987</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Null pointer constant</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf">N2431</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Strongly-typed enums</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2347.pdf">N2347</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Forward declarations for enums</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2764.pdf">N2764</a>
      <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1206">DR1206</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Standardized attribute syntax</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2761.pdf">N2761</a></td>
      <td class="full" align="center">Clang 3.3 <a href="#n2761">(1)</a></td>
    </tr>
    <tr>
      <td>Generalized constant expressions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2235.pdf">N2235</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Alignment support</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2341.pdf">N2341</a></td>
      <td class="full" align="center">Clang 3.3</td>
    </tr>
    <tr>
      <td>Conditionally-support behavior</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1627.pdf">N1627</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Changing undefined behavior into diagnosable errors</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1727.pdf">N1727</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Delegating constructors</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1986.pdf">N1986</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Inheriting constructors</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2540.htm">N2540</a></td>
      <td class="full" align="center">Clang 3.3</td>
    </tr>
    <tr>
      <td>Explicit conversion operators</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2437.pdf">N2437</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>New character types</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2249.html">N2249</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Unicode string literals</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.htm">N2442</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Raw string literals</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.htm">N2442</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Universal character names in literals</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2170.html">N2170</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>User-defined literals</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2765.pdf">N2765</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Standard Layout Types</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2342.htm">N2342</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Defaulted functions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Deleted functions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Extended friend declarations</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1791.pdf">N1791</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Extending <code>sizeof</code></td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2253.html">N2253</a>
      <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#850">DR850</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Inline namespaces</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2535.htm">N2535</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Unrestricted unions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2544.pdf">N2544</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Local and unnamed types as template arguments</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm">N2657</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Range-based for</td>
      <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2930.html">N2930</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Explicit virtual overrides</td>
      <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2928.htm">N2928</a>
      <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3206.htm">N3206</a>
      <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3272.htm">N3272</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Minimal support for garbage collection and reachability-based leak detection</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2670.htm">N2670</a></td>
      <td class="na" align="center">N/A <a href="#n2670">(2)</a></td>
    </tr>
    <tr>
      <td>Allowing move constructors to throw [noexcept]</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3050.html">N3050</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Defining move special member functions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3053.html">N3053</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>

    <tr class="separator">
      <th align="center" colspan="3">Concurrency</th>
    </tr>
    <tr>
      <td>Sequence points</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2239.html">N2239</a></td>
      <td class="full" align="center">Clang 3.3</td>
    </tr>
    <tr>
      <td>Atomic operations</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2427.html">N2427</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Strong Compare and Exchange</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2748.html">N2748</a></td>
      <td class="full" align="center">Clang 3.1 <a href="#n2748">(3)</a></td>
    </tr>
    <tr>
      <td>Bidirectional Fences</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2752.htm">N2752</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>

    <tr>
      <td>Memory model</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2429.htm">N2429</a></td>
      <td class="full" align="center">Clang 3.2</td>
    </tr>
    <tr>
      <td>Data-dependency ordering: atomics and memory model</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2664.htm">N2664</a></td>
      <td class="full" align="center">Clang 3.2 <a href="#n2664">(4)</a></td>
    </tr>
    <tr>
      <td>Propagating exceptions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2179.html">N2179</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Allow atomics use in signal handlers</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2547.htm">N2547</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Thread-local storage</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2659.htm">N2659</a></td>
      <td class="full" align="center">Clang 3.3 <a href="#n2659">(5)</a></td>
    </tr>
    <tr>
      <td>Dynamic initialization and destruction with concurrency</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2660.htm">N2660</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>

    <tr class="separator">
      <th align="center" colspan="3">C99 Features in C++11</th>
    </tr>
    <tr>
      <td><code>__func__</code> predefined identifier</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2340.htm">N2340</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>C99 preprocessor</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1653.htm">N1653</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td><code>long long</code></td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1811.pdf">N1811</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Extended integral types</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1988.pdf">N1988</a></td>
      <td class="na" align="center">N/A <a href="#n1988">(6)</a></td>
    </tr>
</table>

<p>
<span id="n2761">(1): The <code>[[carries_dependency]]</code> attribute
has no effect.</span><br>
<span id="n2670">(2): No compiler changes are required for an implementation
such as Clang that does not provide garbage collection.</span><br>
<span id="n2748">(3): All compare-exchange operations are emitted as
strong compare-exchanges.</span><br>
<span id="n2664">(4): <code>memory_order_consume</code> is lowered to
<code>memory_order_acquire</code>.</span><br>
<span id="n2659">(5): <code>thread_local</code> support
requires a C++ runtime library providing <code>__cxa_thread_atexit</code>, such
as <a href="http://libcxxabi.llvm.org">libc++abi</a> 3.6 or later,
or libsupc++ 4.8 or later.</span><br>
<span id="n1988">(6): No compiler changes are required for an implementation
such as Clang that does not provide any extended integer types.
<code>__int128</code> is not treated as an extended integer type,
because changing <code>intmax_t</code> would be an ABI-incompatible
change.</span>
</p>
</details>

<h2 id="cxx14">C++14 implementation status</h2>

<p>Clang 3.4 and later implement all of the <a
    href="http://www.iso.org/iso/catalogue_detail.htm?csnumber=64029">ISO
    C++ 2014 standard</a>.

<p>You can use Clang in C++14 mode with the <code>-std=c++14</code> option
(use <code>-std=c++1y</code> in Clang 3.4 and earlier).</p>

<details>
<summary>List of features and minimum Clang version with support</summary>

<table width="689" border="1" cellspacing="0">
 <tr>
    <th>Language Feature</th>
    <th>C++14 Proposal</th>
    <th>Available in Clang?</th>
 </tr>
    <tr>
      <td>Tweak to certain C++ contextual conversions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3323.pdf">N3323</a></td>
      <td class="full" align="center">Clang 3.4</td>
    </tr>
    <tr>
      <td>Binary literals</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3472.pdf">N3472</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>decltype(auto)</td>
      <td rowspan=2 style="vertical-align:middle"><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3638.html">N3638</a></td>
      <td class="full" align="center">Clang 3.3</td>
    </tr>
    <tr>
      <td>Return type deduction for normal functions</td>
      <td class="full" align="center">Clang 3.4</td>
    </tr>
    <tr>
      <td>Initialized lambda captures</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3648.html">N3648</a></td>
      <td class="full" align="center">Clang 3.4</td>
    </tr>
    <tr>
      <td>Generic lambdas</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3649.html">N3649</a></td>
      <td class="full" align="center">Clang 3.4</td>
    </tr>
    <tr>
      <td>Variable templates</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3651.pdf">N3651</a></td>
      <td class="full" align="center">Clang 3.4</td>
    </tr>
    <tr>
      <td>Relaxing requirements on constexpr functions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3652.html">N3652</a></td>
      <td class="full" align="center">Clang 3.4</td>
    </tr>
    <tr>
      <td>Member initializers and aggregates</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3653.html">N3653</a></td>
      <td class="full" align="center">Clang 3.3</td>
    </tr>
    <tr>
      <td>Clarifying memory allocation</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3664.html">N3664</a></td>
      <td class="full" align="center">Clang 3.4</td>
    </tr>
    <tr>
      <td><tt>[[deprecated]]</tt> attribute</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3760.html">N3760</a></td>
      <td class="full" align="center">Clang 3.4</td>
    </tr>
    <tr>
      <td>Single quotation mark as digit separator</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3781.pdf">N3781</a></td>
      <td class="full" align="center">Clang 3.4</td>
    </tr>
    <tr>
      <td>C++ Sized Deallocation</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3778.html">N3778</a></td>
      <td class="full" align="center">Clang 3.4 <a href="#n3778">(7)</a></td>
    </tr>
</table>

<p>
<span id="n3778">(7): In Clang 3.7 and later, sized deallocation is only enabled
if the user passes the <code>-fsized-deallocation</code> flag. The user must
supply definitions of the sized deallocation functions, either by providing them
explicitly or by using a C++ standard library that does. <code>libstdc++</code>
added these functions in version 5.0, and <code>libc++</code> added them in
version 3.7.
</span>
</p>
</details>

<h2 id="cxx17">C++1z implementation status</h2>

<p>Clang has <b>experimental</b> support for some proposed features of
the C++ standard following C++14, provisionally named C++1z.
Note that support for these features may change or be removed without notice,
as the draft C++1z standard evolves.

<p>You can use Clang in C++1z mode with the <code>-std=c++1z</code> option.</p>

<details open>
<summary>List of features and minimum Clang version with support</summary>

<table width="689" border="1" cellspacing="0">
 <tr>
    <th>Language Feature</th>
    <th>C++1z Proposal</th>
    <th>Available in Clang?</th>
 </tr>
    <!-- Issaquah 2014 papers -->
    <tr>
      <td><tt>static_assert</tt> with no message</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3928.pdf">N3928</a></td>
      <td class="full" align="center">Clang 3.5</td>
    </tr>
    <!-- Rapperswil papers -->
    <tr>
      <td>Disabling trigraph expansion by default</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4086.html">N4086</a></td>
      <td class="full" align="center">Clang 3.5</td>
    </tr>
    <!--
    <tr>
      <td rowspan="2">Terse range-based for loops (removed from C++1z)</td>
      <td rowspan="2"><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3994.htm">N3994</a></td>
      <td class="none" align="center">Clang 3.5: Yes</td>
    </tr>
    <tr>
      <td class="svn" align="center">SVN: No</td>
    </tr>
    -->
    <tr>
      <td><tt>typename</tt> in a template template parameter</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4051.html">N4051</a></td>
      <td class="full" align="center">Clang 3.5</td>
    </tr>
    <tr>
      <td>New <tt>auto</tt> rules for direct-list-initialization
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3922.html">N3922</a></td>
      <td class="full" align="center">Clang 3.8 <a href="#n3922">(8)</a></td>
    </tr>
    <!-- Urbana papers -->
    <tr>
      <td rowspan="2">Fold expressions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4295.html">N4295</a></td>
      <td class="full" align="center">Clang 3.6</td>
    </tr>
      <tr> <!-- from Jacksonville -->
        <td><a href="http://wg21.link/p0036r0">P0036R0</a></td>
        <td class="full" align="center">Clang 3.9</td>
      </tr>
    <tr>
      <td><tt>u8</tt> character literals</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4267.html">N4267</a></td>
      <td class="full" align="center">Clang 3.6</td>
    </tr>
    <tr>
      <td>Nested namespace definition</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4230.html">N4230</a></td>
      <td class="full" align="center">Clang 3.6</td>
    </tr>
    <tr>
      <td>Attributes for namespaces and enumerators</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4266.html">N4266</a></td>
      <td class="full" align="center">Clang 3.6</td>
    </tr>
    <tr>
      <td>Allow constant evaluation for all non-type template arguments</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4268.html">N4268</a></td>
      <td class="full" align="center">Clang 3.6</td>
    </tr>
    <!-- Kona papers -->
    <tr>
      <td>Remove deprecated <tt>register</tt> storage class</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0001r1.html">P0001R1</a></td>
      <td class="full" align="center">Clang 3.8</td>
    </tr>
    <tr>
      <td>Remove deprecated <tt>bool</tt> increment</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0002r1.html">P0002R1</a></td>
      <td class="full" align="center">Clang 3.8</td>
    </tr>
    <tr>
      <td>Make exception specifications part of the type system</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0012r1.html">P0012R1</a></td>
      <td class="full" align="center">Clang 4</td>
    </tr>
    <tr>
      <td><tt>__has_include</tt> in preprocessor conditionals</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0061.html">P0061R1</a></td>
      <td class="full" align="center">Yes</td>
    </tr>
    <tr>
      <td>New specification for inheriting constructors (<a href="cxx_dr_status.html#1941">DR1941</a> et al)</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0136r1.html">P0136R1</a></td>
      <td class="full" align="center">Clang 3.9 <a href="#p0136">(9)</a></td>
    </tr>
    <!-- Jacksonville papers -->
    <tr>
      <td><tt>[[fallthrough]]</tt> attribute</td>
      <td><a href="http://wg21.link/p0188r1">P0188R1</a></td>
      <td class="full" align="center">Clang 3.9</td>
    </tr>
    <tr>
      <td><tt>[[nodiscard]]</tt> attribute</td>
      <td><a href="http://wg21.link/p0189r1">P0189R1</a></td>
      <td class="full" align="center">Clang 3.9</td>
    </tr>
    <tr>
      <td><tt>[[maybe_unused]]</tt> attribute</td>
      <td><a href="http://wg21.link/p0212r1">P0212R1</a></td>
      <td class="full" align="center">Clang 3.9</td>
    </tr>
    <tr>
      <td>Aggregate initialization of classes with base classes</td>
      <td><a href="http://wg21.link/p0017r1">P0017R1</a></td>
      <td class="full" align="center">Clang 3.9</td>
    </tr>
    <tr>
      <td><tt>constexpr</tt> lambda expressions</td>
      <td><a href="http://wg21.link/p0170r1">P0170R1</a></td>
      <td class="svn" align="center">SVN</td>
    </tr>
    <tr>
      <td>Differing <tt>begin</tt> and <tt>end</tt> types in range-based <tt>for</tt></td>
      <td><a href="http://wg21.link/p0184r0">P0184R0</a></td>
      <td class="full" align="center">Clang 3.9</td>
    </tr>
    <tr>
      <td>Lambda capture of <tt>*this</tt></td>
      <td><a href="http://wg21.link/p0018r3">P0018R3</a></td>
      <td class="full" align="center">Clang 3.9</td>
    </tr>
    <tr>
      <td>Direct-list-initialization of <tt>enum</tt>s</td>
      <td><a href="http://wg21.link/p0138r2">P0138R2</a></td>
      <td class="full" align="center">Clang 3.9</td>
    </tr>
    <tr>
      <td>Hexadecimal floating-point literals</td>
      <td><a href="http://wg21.link/p0245r1">P0245R1</a></td>
      <td class="full" align="center">Yes</td>
    </tr>
    <!-- Oulu papers -->
    <tr>
      <td>Using attribute namespaces without repetition</td>
      <td><a href="http://wg21.link/p0028r4">P0028R4</a></td>
      <td class="full" align="center">Clang 3.9</td>
    </tr>
    <tr>
      <td>Dynamic memory allocation for over-aligned data</td>
      <td><a href="http://wg21.link/p0035r4">P0035R4</a></td>
      <td class="full" align="center">Clang 4</td>
    </tr>
    <tr>
      <td rowspan="2">Template argument deduction for class templates</td>
      <td><a href="http://wg21.link/p0091r3">P0091R3</a></td>
      <td rowspan="2" class="svn" align="center">SVN</td>
    </tr>
      <tr> <!-- from Issaquah -->
        <td><a href="http://wg21.link/p0512r0">P0512R0</a></td>
      </tr>
    <tr>
      <td>Non-type template parameters with <tt>auto</tt> type</td>
      <td><a href="http://wg21.link/p0127r2">P0127R2</a></td>
      <td class="full" align="center">Clang 4</td>
    </tr>
    <tr>
      <td>Guaranteed copy elision</td>
      <td><a href="http://wg21.link/p0135r1">P0135R1</a></td>
      <td class="full" align="center">Clang 4</td>
    </tr>
    <tr>
      <td rowspan=2>Stricter expression evaluation order</td>
      <td><a href="http://wg21.link/p0145r3">P0145R3</a></td>
      <td class="full" align="center" rowspan=2>Clang 4 <a href="#p0145">(10)</a></td>
    </tr>
    <tr>
      <td><a href="http://wg21.link/p0400r0">P0400R0</a></td>
    </tr>
    <tr>
      <td>Requirement to ignore unknown attributes</td>
      <td><a href="http://wg21.link/p0283r2">P0283R2</a></td>
      <td class="full" align="center">Yes</td>
    </tr>
    <tr>
      <td><tt>constexpr</tt> <em>if-statement</em>s</td>
      <td><a href="http://wg21.link/p0292r2">P0292R2</a></td>
      <td class="full" align="center">Clang 3.9</td>
    </tr>
    <tr>
      <td>Inline variables</td>
      <td><a href="http://wg21.link/p0386r2">P0386R2</a></td>
      <td class="full" align="center">Clang 3.9</td>
    </tr>
    <tr>
      <td>Structured bindings</td>
      <td><a href="http://wg21.link/p0217r3">P0217R3</a></td>
      <td class="full" align="center">Clang 4</td>
    </tr>
    <tr>
      <td>Separate variable and condition for <tt>if</tt> and <tt>switch</tt></td>
      <td><a href="http://wg21.link/p0305r1">P0305R1</a></td>
      <td class="full" align="center">Clang 3.9</td>
    </tr>
    <!-- Issaquah 2016 papers -->
    <tr>
      <td>Matching template template parameters to compatible arguments</td>
      <td><a href="http://wg21.link/p0522r0">P0522R0</a></td>
      <td class="partial" align="center">Partial <a href="#p0522">(12)</a></td>
    </tr>
    <tr>
      <td>Removing deprecated dynamic exception specifications</td>
      <td><a href="http://wg21.link/p0003r5">P0003R5</a></td>
      <td class="full" align="center">Clang 4</td>
    </tr>
    <tr>
      <td>Pack expansions in <em>using-declarations</em></td>
      <td><a href="http://wg21.link/p0195r2">P0195R2</a></td>
      <td class="full" align="center">Clang 4</td>
    </tr>
</table>

<p>
<span id="n3922">(8): This is a backwards-incompatible change that is applied to
all language versions that allow type deduction from <tt>auto</tt>
(per the request of the C++ committee).
In Clang 3.7, a warning is emitted for all cases that would change meaning.
</span><br>
<span id="p0136">(9): This is the resolution to a Defect Report, so is applied
to all language versions supporting inheriting constructors.
</span><br>
<span id="p0145">(10): Under the MS ABI, function parameters are destroyed from
left to right in the callee. As a result, function parameters in calls to
<tt>operator&lt;&lt;</tt>, <tt>operator&gt;&gt;</tt>, <tt>operator-&gt;*</tt>,
<tt>operator&amp;&amp;</tt>, <tt>operator||</tt>, and <tt>operator,</tt>
functions using expression syntax are no longer guaranteed to be destroyed in
reverse construction order in that ABI.
</span><br>
<span id="p0522">(12): Despite being the the resolution to a Defect Report, this
feature is disabled by default in all language versions, and can be enabled
explicitly with the flag <tt>-frelaxed-template-template-args</tt> in Clang 4.
The change to the standard lacks a corresponding change for template partial
ordering, resulting in ambiguity errors for reasonable and previously-valid
code. This issue is expected to be rectified soon.
</span>
</p>
</details>

<h2 id="ts">Technical specifications and standing documents</h2>

<p>ISO C++ also publishes a number of documents describing additional language
and library features that are not part of standard C++.</p>

<details open>
<summary>List of features and minimum Clang version with support</summary>

<table width="689" border="1" cellspacing="0">
 <tr>
    <th>Document</th>
    <th>Latest draft</th>
    <th>Compiler flag</th>
    <th>Available in Clang?</th>
 </tr>
    <tr>
      <td rowspan="3">SD-6: SG10 feature test recommendations</td>
      <td rowspan="3"><a href="http://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations">SD-6</a></td>
      <td rowspan="3">N/A</td>
      <td class="full" align="center">
        Clang 3.4 (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3745">N3745</a>)</br>
      </td>
    </tr>
    <tr>
      <td class="full" align="center">
        Clang 3.6 (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4200">N4200</a>)</a>
      </td>
    </tr>
    <tr>
      <td class="full" align="center">
        Clang 4 (<a href="http://wg21.link/p0096r3">P0096R3</a>)</a>
      </td>
    </tr>
    <!-- FIXME: Implement latest recommendations.
    <tr>
      <td class="svn" align="center">
        SVN (<a href="http://wg21.link/p0096r3">P0096R3</a>)</a>
      </td>
    </tr>
    -->
    <!-- No compiler support is known to be needed for:
           * Concurrency TS
           * Parallelism TS
           * Ranges TS
           * Networking TS
           * File System TS
    -->
    <tr>
      <td>[TS] Concepts</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0121r0.pdf">P0121R0</a></td>
      <td></td>
      <td class="none" align="center">WIP</td>
    </tr>
    <tr>
      <td>[DRAFT TS] Coroutines</td>
      <td><a href="https://isocpp.org/files/papers/N4663.pdf">N4663</a></td>
      <td><tt>&#8209;fcoroutines&#8209;ts<br>-stdlib=libc++</tt></td>
      <td class="svn" align="center">SVN</td>
    </tr>
    <tr>
      <td>[TS] Library Fundamentals, Version 1 (invocation type traits)</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4480.html">N4480</a></td>
      <td>N/A</td>
      <td class="none" align="center">No</td>
    </tr>
    <tr>
      <td>[DRAFT TS] Library Fundamentals, Version 2 (<tt>source_location</tt>)</td>
     <td><a href="http://wg21.link/n4600">N4600</a></td>
      <td>N/A</td>
      <td class="none" align="center">No</td>
    </tr>
    <tr>
      <td>[DRAFT TS] Modules</td>
      <td><a href="http://wg21.link/n4592">N4592</a></td>
      <td><tt>-fmodules-ts</tt></td>
      <td class="none" align="center">WIP</td>
    </tr>
    <tr>
      <td>[TS] Transactional Memory</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4514.pdf">N4514</a></td>
      <td></td>
      <td class="none" align="center">No</td>
    </tr>
</table>
</details>

</div>
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</html>
